Update module contrib.go.opencensus.io/exporter/zipkin to v0.1.2

This MR contains the following updates:

Package	Type	Update	Change
contrib.go.opencensus.io/exporter/zipkin	require	patch	v0.1.1 -> v0.1.2

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Release Notes

census-ecosystem/opencensus-go-exporter-zipkin

v0.1.2

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